Stephen W. Bergstrom was named president and chief operating officer of Dynegy Inc. Bergstrom formerly was president and COO of Dynegy Marketing and Trade and senior vice president of Dynegy Inc.
Texas-New Mexico Power Co. promoted Robert E. Castillo to vice president and regional customer officer for its Mountain Region. Castillo, formerly assistant vice president-New Mexico, replaces Allan Davis, who retired after 34 years with TNMP.
William W. Schivley was named president of Select Energy, Northeast Utilities System's marketing affiliate.
